0 . 2   g of an organic compound was subjected to estimation of nitrogen by Dumas method in which…

Volume of N₂ gas is equal to 22.4 ml at STP
Mole of N₂ gas = $\frac{22.4}{22400}=\frac{1}{1000}$
Weight of N₂ gas =$\frac{1}{1000}\mathrm{X} 28$

% of N in organic compound $=$$\frac{28}{1000}\mathrm{X} \frac{100}{0.2}=14\%$

Hence, The percentage of nitrogen in the compound is 14%